Metallate
Metallate or metalate is the name given to any complex anion containing a metal ligated to two or more atoms and/or groups of atoms.
Typically, the metal is one of the transition elements and the ligand is oxygen or another chalcogenide, a cyanide group or a halogen.
The chalcogenide metallates are known as oxometallates, thiometallates, selenometallates and tellurometallates; the cyanide metallates are known as cyanometallates; the halogenide metalates are known as halogenometallates.
Oxometallates include permanganate, chromate, vanadate or and tungstate.
Thiometallates include tetrathiovanadate, tetrathiomolybdate, tetrathiotungstate and similar ions.
Cyanometallates include ferricyanide, ferrocyanide and dicyanoargentate.
Halogenometallates include tetrachloroaluminate, tetrachloronickelate and hexafluoroplatinate.
Others include tetranitratoaluminate and tetrahydroxozincate.
Metallate is also used as a verb by bioinorganic chemistry to describe the act of adding metal atoms or ions to a site.